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EP2174621B1 - Prothèse - Google Patents

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Publication number
EP2174621B1
EP2174621B1 EP09169709.4A EP09169709A EP2174621B1 EP 2174621 B1 EP2174621 B1 EP 2174621B1 EP 09169709 A EP09169709 A EP 09169709A EP 2174621 B1 EP2174621 B1 EP 2174621B1
Authority
EP
European Patent Office
Prior art keywords
cup
band
prosthesis
liner
acetabular cup
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP09169709.4A
Other languages
German (de)
English (en)
Other versions
EP2174621A1 (fr
Inventor
Michael Antony Tuke
Andrew Clive Taylor
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Finsbury Development Ltd
Original Assignee
Finsbury Development Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB0818326A external-priority patent/GB0818326D0/en
Priority claimed from GB0818505A external-priority patent/GB0818505D0/en
Application filed by Finsbury Development Ltd filed Critical Finsbury Development Ltd
Priority to EP12183609.2A priority Critical patent/EP2561832B1/fr
Publication of EP2174621A1 publication Critical patent/EP2174621A1/fr
Application granted granted Critical
Publication of EP2174621B1 publication Critical patent/EP2174621B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for 
    • B23P11/02—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for  by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for 
    • B23P11/02—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for  by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits
    • B23P11/025—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for  by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits by using heat or cold
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/0095—Packages or dispensers for prostheses or other implants
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/3006—Properties of materials and coating materials
    • A61F2002/30077—Properties of materials and coating materials shrinkable
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30667—Features concerning an interaction with the environment or a particular use of the prosthesis
    • A61F2002/30718—Means for protecting prosthetic parts, e.g. during operation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A61F2002/3412—Acetabular cups with pins or protrusions, e.g. non-sharp pins or protrusions projecting from a shell surface
    • A61F2002/3417—Acetabular cups with pins or protrusions, e.g. non-sharp pins or protrusions projecting from a shell surface the outer shell having protrusions on meridian lines, e.g. equidistant fins or wings around the equatorial zone
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A61F2002/3445—Acetabular cups having a number of shells different from two
    • A61F2002/3446—Single cups
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2210/00—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2210/0066—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof shrinkable
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/49865—Assembling or joining with prestressing of part by temperature differential [e.g., shrink fit]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49945—Assembling or joining by driven force fit

Definitions

  • the present invention relates to a prosthesis. More particularly, it relates to a preassembled acetabular component for a hip prosthesis and a process for the production thereof.
  • Each hip joint is comprised by the upper portion of the femur which terminates in an offset bony neck surmounted by a ball-headed portion which rotates within the acetabulum in the pelvis.
  • Diseases such as rheumatoid- and osteo-arthritis can cause erosion of the cartilage lining of the acetabulum so that the ball of the femur and the hip bone rub together causing pain and further erosion. Bone erosion may cause the bones themselves to attempt to compensate for the erosion which may result in the bone becoming misshapen.
  • the hip prosthesis will be formed of two components, namely: an acetabular component which lines the acetabulum; and a femoral component which replaces the femoral head.
  • the femoral component may be total femoral head replacement in which case the component includes a head, neck and a stem which in use in inserted into the end of a prepared femur.
  • the femoral head component may be a resurfacing prosthesis which is attached to the head of the femur once it has been suitably machined.
  • a prosthetic acetabulum in a patient's pelvis the surgeon first uses a reamer to cut a cavity of appropriate size in the patient's pelvis. An acetabular cup is then inserted into the cavity.
  • appropriate size is meant a size which is selected by the surgeon as being the most appropriate for that particular patient. Normally, it is desirable to retain as much of the original healthy bone surface as possible.
  • acetabular cups are sold in a range of sizes to suit the needs of individual patients. Generally, acetabular cups are available in sizes of from 42 mm to 62 mm diameter with 2 mm increments between neighboring sizes.
  • One type of cup is those made from polyethylene. They are generally cemented into the acetabulum and require only light pressure to seat them in the cement.
  • One alternative cup type has a polyethylene liner unit for articulation with the femur and a metal shell for insertion into the pelvic cavity.
  • These cups with metal shells may be implanted without cement such that they rely on a jam fit between the metal shell and the patient's acetabulum.
  • screws may be used to secure the cup shell in position in the pelvis before the liner is applied into position.
  • the insertion of the metal shell into the pelvis requires considerable force. As the surgeon applies this force, there is a risk that the metal shell can become damaged or deformed. There is also a possibility that during the application of the force, the shell may be moved so that it is not in the optimum alignment in the acetabulum.
  • the metal shells have outer surfaces or coatings which encourage bone to grow into them over time.
  • the polyethylene liner unit is snapped or screwed into the metal shell after the metal shell has been seated in the acetabulum.
  • the inner surface of the liner forms the socket part of the joint.
  • the metal shell which is generally formed from titanium and which is of a similar thickness to the arrangement in which a polyethylene liner is used, is inserted into the acetabulum.
  • the ceramic liner is then inserted into the shell. It can be difficult for the liner to be accurately aligned in the shell.
  • this insertion of the liner does require the application of a considerable force which is usually applied by the surgeon using a mallet often via an insertion tool. Considerable force is generally required to achieve a successful interface. However, this force can damage the ceramic liner.
  • surgeons are not generally able to apply a controlled amount of force applied. Some surgeons may not apply sufficient force in one hit and it may be necessary for a plurality of hits to be used. These may not all strike at the same angle and may not each apply the same force. Other surgeons may apply a much greater single strike.
  • the force applied by the surgeon on, for example, an insertion tool may vary considerably and can be of the order of about 3 to 5 kN but can also be much higher and may even be of the order of about 35 kN.
  • the liner may be incorrectly seated in the shell which can lead to various disadvantages. Not only is there a risk that where a portion of the liner stands above the rim of the cup, a point of irritation can be produced but also, there is a risk that material, such as wear debris, may congregate against the raised portion of the liner or against the wall of the cup in the area where the liner sits below the rim. This accumulation of debris may provide a site for post-onerative infection Even if the liner is correctly located and the shell is not deformed during the assembly process, it may become deformed on insertion of the prosthesis into the pelvis such that the shell may become spaced from the liner over at least a portion of the prosthesis.
  • a further problem which may be encountered is that while inserting the liner in the shell it may become damaged. If this damage is a chip or crack on the outer surface of the liner, i.e. on the surface adjacent to the surface of the shell, its presence may not be noticed by the surgeon during assembly. However, its existence will be a point of weakness which can result in the prosthesis failing in use.
  • a preassembled unit acetabular cup prosthesis comprising: an outer shell; and a ceramic liner located within the shell.
  • the preassembled unit may be assembled ex-vivo under a controlled force selected to optimise the pre-stressing of the components of the prosthesis.
  • This arrangement provides acetabular components which reduces the risk of liner misplacement and which has enhanced life expectancy arising, in part, through improved resistance to damage caused during impaction into the acetabulum. It is also desirable to provide an acetabular cup prosthesis which can be easily handled and inserted during surgery without damage to the acetabular cup prosthesis and which minimizes the risk of debris being trapped between the cup and the liner.
  • DE19640747 , FR2825911 , DE10006098 and FR2749162 relate to acetabular cup implants for use in bone-socket replacement surgery.
  • US 5405402 discloses an implantable prosthesis comprising a polyethylene prosthetic member that is substantially transparent to x-rays and a radiographic marker that is substantially opaque to x-rays.
  • the radiographic mark is configured as a tension spring arranged as a continuous ring encircling the prosthetic member.
  • EP 143 3443 discloses a hip prosthesis comprising a metal support element and a ceramic bearing element which is permanently fixed to the metal support element.
  • the support element is fixed to the bearing element by diffusion bonding, active alloy brazing or by a heat shrink technique.
  • An intermediate element may be disposed between the support element and bearing element to improve adhesion and/or to provide some shock absorption.
  • FR 2 825 911 disclolses the features of the preamble of claim 1.
  • an acetabular cup prosthesis which is made substantially from ceramic.
  • acetabular cup prosthesis made formed from ceramic offer various advantages, they may suffer from various disadvantages.
  • the ceramic may not have sufficient strength to withstand the rigors of insertion. Further even if the ceramic cup can be successfully inserted in the pelvis without damage, due to the structure of the surface there may be little or no torsional stability.
  • the acetabular cup does include a thin metal shell, there may be a need to provide additional strength or additional torsional stability.
  • an comprising: a ceramic acetabular cup having a rim; and a metal band being D-shaped in cross-section and being applied around the outer circumference of the acetabular cup prosthesis and adjacent to said rim; said metal band providing hoop compression to said cup.
  • the presence of the metal band applied around the outer circumference of the acetabular cup prosthesis and adjacent the rim thereof provides additional strength to the prosthesis and in particular provides the required level of hoop compression.
  • the acetabular cup of the present invention is be formed of a ceramic.
  • the prosthesis of the present invention provides a prosthesis with improved properties over prior art prosthesis.
  • the prothesis of the present invention has improved resistance to fracture.
  • the cup is a ceramic cup or includes a ceramic liner
  • the presence of the band will serve to pre-stress the ceramic. This pre-stressing occurs during the controlled assembly process. Unstressed ceramic liners such as those of the prior art, are prone to fracture in use. Stressing of the components of the prosthesis is discussed in more detail below. prone to fracture in use. Stressing of the components of the prosthesis is discussed in more detail below.
  • the band of the prosthesis is made from metal. Any suitable metal may be used, with titanium being particularly preferred. Cobalt/chromium may also be used.
  • the outer surface of the band may be provided with one or more ribs extending away from the cup. In use these ribs will interact with the pelvis to provide the required torsional stability. In one arrangement one or more, preferably three, ribs may be located at a plurality of points around the circumference of the band. In one arrangement one or more, preferably three ribs, may be located at three equally spaced positions around the circumference.
  • the ribs may be of any suitable configuration. Where there is one or more ribs present, the ribs may be of the same or of different configurations. In one arrangement, the or each rib may be a longitudinal extension.
  • the band may be configured on its out surface to promote bone integration.
  • the outer surface may be coated with a bone growth promoting material such as hydroxyapatite.
  • this may be coated on its outer surface with material to promote bone integration.
  • the outer surface may be coated with a bone growth promoting material such as hydroxyapatite.
  • a shell may be a titanium shell. If used, the titanium shell has a thickness in the region of about 1 mm to about 3 mm.
  • the ceramic cup or liner may be formed of any material which has acceptable biocompatibility, hardness and wear resistance. Suitable ceramic materials include silicon nitride, doped silicon nitride, an alumina-zirconia ceramic, yttria, stabilized zirconia, ceria, stabilized zirconia, zirconia ceramics, alumina ceramics, oxinium or mixtures thereof.
  • the thickness of the ceramic cup or liner is preferably in the region of from about 2 mm to about 5 mm.
  • the ceramic will generally be shaped in the region of the rim where the band is applied such that when the band is in position, the external profile of the prosthesis (ignoring any ribs or other biting configurations) will correspond to that of a ceramic cup prosthesis not having a band.
  • the cup with the band will still have the approximately hemispherical outer configuration.
  • the thickness of the band will generally be of the order of a few millimeters.
  • the surface of the band which will be in contact with the cup will generally be flat whereas the outer surface of the band may be curved and as such the shape of the band in cross-section may be D-shaped. At the thickest point it may have a thickness of the order of about 1 mm to about 3 mm.
  • the band may be applied to the acetabular cup by any suitable means. In one arrangement, it may be press fitted onto the cup. Since the band is a tight fit on the cup press fitting onto the cup may present difficulties. In one arrangement, the band may be heated to allow it to be correctly fitted. In one arrangement, the heating may be by induction heating. A benefit of induction heating is that only the metal band will be effected and the ceramic cup will not be heated. The induction heating may be carried out by any suitable means.
  • the press fit may require load to be applied. The load required may depend on the temperature to which the band is heated. In one arrangement, heating may be to from about 500 to about 700°C. In one arrangement approximately 5kN load may be used for the press-fitting.
  • a process for forming the acetabular cup prosthesis of the above first aspect comprising the step of heating the band before applying it to the cup.
  • the loading of the band on the cup will generally act to pre-stress the cup in an optimum manner such that separation between the band and the cup will not occur.
  • the band being metal is strong in hoop tension whereas the ceramic cup is strong in hoop compression.
  • the tensions are optimised.
  • the residual stress in the ceramic may be engineered to a value that optimises performance and is compressive.
  • the compressive interface between the two components is maintained throughout the entirety of the loading of the prosthesis in vivo.
  • a further advantage of the present invention is that the acetabular cup prosthesis of the present invention has sufficient strength to withstand the forces supplied during the insertion of the prosthesis into the acetabulum without damage, distortion or separation of the band from the cup.
  • the sphericity of the prosthesis is substantially maintained even though the diameter is reduced due to the localised compression at the rim of the liner.
  • the prosthesis of the present invention may be provided with an impaction cap.
  • the impaction cap may be pre-assembled with the prosthesis as described in EP2008618 .
  • the impaction cup is configured such that the force applied to impact the prosthesis into the acetabulum is directed via the ceramic cup so that any shock passing through the metal band is minimised.
  • the prosthesis 1 of the present invention comprises a cup 2 and a titanium band 3 located around the external surface of the cup and adjacent to the rim 4 of the cup 2.
  • Ribs 5 are located on the external surface of the band and are configured such that when located in the pelvis torsional movement of the cup in the pelvis is resisted.
  • the shape of the cup 2 before the band 3 is applied is illustrated schematically in Figure 2 .
  • the band 3 is shaped so that the hemispherical external surface of the cup is completed.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Mechanical Engineering (AREA)
  • Vascular Medicine (AREA)
  • Transplantation (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Cardiology (AREA)
  • Prostheses (AREA)

Claims (7)

  1. Prothèse de cupule de cotyle (1) comprenant une cupule de cotyle (2) ayant un bord (4) ; et une bande de métal (3) appliquée autour de la circonférence extérieure de la prothèse de cupule de cotyle et adjacente audit bord ; ladite bande de métal fournissant un cerclage de compression à ladite cupule, caractérisée en ce que la cupule est une cupule de cotyle céramique et en ce que la bande présente une forme en « D » en section.
  2. Cupule de cotyle selon la revendication 1 dans laquelle le métal est du titane.
  3. Cupule de cotyle selon la revendication 1 ou 2 dans laquelle la surface externe de la bande comporte des nervures (5) s'étendant en saillie depuis la cupule.
  4. Cupule de cotyle selon la revendication 3 dans laquelle la bande, au point le plus épais, a une épaisseur comprise entre environ 1 mm et environ 3 mm.
  5. Procédé pour obtenir une prothèse de cupule de cotyle selon l'une quelconque des revendications 1 à 4 dans lequel la bande est emmanchée à force sur la cupule.
  6. Procédé selon la revendication 5 dans lequel la bande est chauffée avant ou pendant l'emmanchement à force.
  7. Procédé selon la revendication 6 dans lequel le chauffage est réalisé par induction.
EP09169709.4A 2008-10-07 2009-09-08 Prothèse Active EP2174621B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12183609.2A EP2561832B1 (fr) 2008-10-07 2009-09-08 Prothèse

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0818326A GB0818326D0 (en) 2008-10-07 2008-10-07 Prosthesis
GB0818505A GB0818505D0 (en) 2008-10-09 2008-10-09 Prosthesis

Related Child Applications (2)

Application Number Title Priority Date Filing Date
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US9339389B2 (en) 2016-05-17
EP2174621A1 (fr) 2010-04-14
EP2561832A1 (fr) 2013-02-27
US20100087930A1 (en) 2010-04-08
US20130123932A1 (en) 2013-05-16
US8372155B2 (en) 2013-02-12
EP2561832B1 (fr) 2015-10-21

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